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- W1972753399 abstract "The surface of B4C was irradiated using nitrogen ions and then examined to determine the alterations in the surface chemical and mechanical properties following implantation. Pure boron was also implanted to compare uptakes and chemistry. The implantations were performed in situ at 10 keV in an ultrahigh vacuum system and at 100 keV using a commercial implanter. For doses up to 5.0 × 1017 atoms cm-2 all implanted nitrogen reacted. The nitrogen implanted (10 keV) into either B4C or boron was chemically in the form of BN. 100 keV nitrogen implantation into boron resulted in BN formation while a boron carbide-nitride species was formed using B4C. Nitrogen doses of about 6.0 × 1017 cm-2 at 100 keV for B4C produced chemical halos, 2 – 6 μm in diameter, around a crater owing to expulsion of a TiB2 particulate impurity. The B4C surface, modified at 100 keV, (dose less than or equal to 5.5 × 1017 cm-2) showed a 60% reduction in the pin wear scar diameter and a 200% increase in the coefficient of friction compared with the unimplanted surface. These changes in the surface chemical and mechanical properties suggest that a hard BN layer forms on B4C following nitrogen ion implantation." @default.
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- W1972753399 date "1988-12-01" @default.
- W1972753399 modified "2023-09-23" @default.
- W1972753399 title "Formation of a BN layer on the surface of B4C using nitrogen implantation" @default.
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- W1972753399 doi "https://doi.org/10.1016/0257-8972(88)90151-x" @default.
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